Question

Given reasons as to why:

(a) almost all 90% of all known compounds are organic in nature.

(b) it is dangerous to burn methane in an insufficient supply of air.

Answer 1

(a) Reason for almost all 90% of all known compounds are organic in nature is given below:

Organic compounds are composed of Carbon atoms($C$) and almost 90% of compounds are known as organic in nature because they are composed of Carbon($C$) and Hydrogen($H$) atoms.

(b) Reason for it is dangerous to burn methane in an insufficient supply of air is given below:

When there is an insufficient amount of air, Methane($C{H}_4$) burns and yields Carbon monoxide gas ($CO$) which is harmful to the health and environment. Through the reaction, we can see how methane burns:

$2\underset{Methane}{C{H}_4\left(g\right)}+\underset{Oxygen}{3O_2\left(g\right)}\to \underset{Carbonmonoxide}{2CO\left(g\right)}+\underset{Water}{4H_{2}O\left(aq\right)}$